Yousefi Razieh, Davis Allen B, Carmona-Reyes Jorge, Matthews Lorin S, Hyde Truell W
CASPER, Physics Department, Baylor University, Waco, Texas 76798-7316, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2014 Sep;90(3):033101. doi: 10.1103/PhysRevE.90.033101. Epub 2014 Sep 2.
Understanding the agglomeration of dust particles in complex plasmas requires knowledge of basic properties such as the net electrostatic charge and dipole moment of the dust. In this study, dust aggregates are formed from gold-coated mono-disperse spherical melamine-formaldehyde monomers in a radiofrequency (rf) argon discharge plasma. The behavior of observed dust aggregates is analyzed both by studying the particle trajectories and by employing computer models examining three-dimensional structures of aggregates and their interactions and rotations as induced by torques arising from their dipole moments. These allow the basic characteristics of the dust aggregates, such as the electrostatic charge and dipole moment, as well as the external electric field, to be determined. It is shown that the experimental results support the predicted values from computer models for aggregates in these environments.
要了解复杂等离子体中尘埃颗粒的团聚现象，需要掌握诸如尘埃的净静电荷和偶极矩等基本特性。在本研究中，在射频（rf）氩放电等离子体中，由涂有金的单分散球形三聚氰胺 - 甲醛单体形成尘埃聚集体。通过研究粒子轨迹以及采用计算机模型来分析观察到的尘埃聚集体的行为，该计算机模型用于研究聚集体的三维结构及其因偶极矩产生的扭矩所引起的相互作用和旋转。这些方法可以确定尘埃聚集体的基本特性，如静电荷、偶极矩以及外部电场。结果表明，实验结果支持这些环境中聚集体计算机模型的预测值。
